function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Annandale, N.', 1],
    ['Bleeker, Pieter', 9],
    ['Blyth, E.', 4],
    ['Garman, S.', 3],
    ['Klunzinger, C. B.', 1],
    ['Macleay, William John', 1],
    ['Müller, J. & Henle, F. G. J.', 6],
    ['Richardson, John', 1],
    ['Rüppell, Wilhem Peter Eduard Simon', 1],
    ['Smith, A.', 1],
    ['Steindachner, F.', 2],
    ['W. Peters', 1],
    ['Werner, F.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=32)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);